Base your answer on the information below and on your knowledge of chemistry. The table below shows data for three isotopes of the same element.
Data for Three Isotopes of an Element
Isotopes
Number of Number of
Protons Neutrons
Atomic
Mass
Natural
Abundance
(%)
Atom D
12
12
23.99
78.99
Atom E
12
13
24.99
10.00
Atom G
12
14
25.98
11.01
Compare the energy of an electron in the first electron shell to the energy of an electron in
the second electron shell in an atom of isotope E.

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chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.